Radio apparatus



March 24, 1925.

c. R. MUELLER RADIO APPARATUS Filed Apiil 4 1921 INVENTOR A 7701c NEPatented Mar. 24, 1925. y

PATENT OFFICE.

C. RUDOLPH MUELLER, OF HIGHLAND PARK, MICHIGAN.

RADIO APPARATUS.

Application filed April 4, 1921. Serial No. 458,584.

To all whom it may concern:

Be it known that I, C. RUDOLPH MUELLER, a citizen of the United Statesof America. residing at Highland Park, in the county of Wayne and Stateof Michigan, have invented certain new and useful Improvements in RadioApparatus, of which the following is a specification, reference beinghad therein to the accompanying drawings.

My inventionrelates to. radio apparatus, and more particularly toinductance coils and mountings therefor used in radio apparatus. Theparticular kind or type of inductance coils to which my inventionrelates is the spider web coil known to the users of radio apparatus asthe Turney type of inductance coil.

'- One object of my invention is to provide an inductance coil mountingwhich will re ceive one or a plurality of inductance coils -which may beeasily and quickly taken off or put on in any suitable number, as conditions may warrant, without change in the mounting apparatus.

Another object of m invention is to provide a mounting where y the angleof either the primary or the tickler coils with rel-4'- tion to thesecondary coil or the distances between the same may be'varied to suitconditions.

Another object is to provide a compact structure, pne easily assembledand in whichmany of the parts serve a plurality of purposes, the wholebeing of simple and cheap construction.

Another object is to provide a structure whereby the secondary coil maybe separated, so that the primary coil may be removed a greater distancefrom the influence of the ticklercoil without entirely removing eitherpart of the secondary coil from the influence of the tickler or primarycoil.

With these and other objects in view, my invention consists in thearrangement, combination and construction of the various ,parts of'myimproved device, as described in the specification, claimed in myclaims, and shown in the accompanying drawings, in which:

Figure 1 is a plan view of a coil mounting constructed in-accordancewith my invention.

Figure 2 is an end view thereof.

Figure 3 is a plan view of my improved coil in an unassembled position,showing the inside face thereof.

Figure 4 is a like view of the same coil, showing the outside facethereof.

Like numerals for the same parts in the various drawings are used.

I provide a main support 1 for the entire structure, with four rods 7projecting laterally therefrom, two on either side of said support, Fig.2 which act as supports upon which are slidablymounted the two side arms2 and 8, which in turn act as supports for the primary and tickler coils27 and 28, respectively. I provide a removable knob 9 on the ends of therods 7 so that the arms 2 and 3 may be removed therefrom if so desired.

In addition vto being slidable laterally on the rods 7 through the clips6, the arms 2 and 3 are capable of swinging movement in a horizontalplane through the hinges 5. In order to accomplish this swingin movementof the arms, I have provided handles 8 on the 'ends thereof nearest theoperator. These handles also serve to allow the lateral movement of thearms, and are removed from the coils a sufiicient distance topractically nullify hand capacity effect when making the adjustment.

A stationary arm 26 projects at right angles to the main support, uponeach side of which may be mounted the secondary coils 29. I have shownthe secondary coils split thus because I believe a definite ad-' vantageis gained over the old method of mounting the secondary coil in onepiece. For the purpose of certain features of my invention, however, thesecondary may be in one piece.

It will thus be seen that I have made arrangement for the mounting: ofthe three different types of coils, namef the primary, secondary andtickler coils, in such a manner that as many coils of each type as isdesired may be used at any desired distance apart and at any desiredangle to each other. i The coils themselves are, as before mentioned, ofthe spider web type consisting of a body portion 30, with centerreenforced apertures 20 and wings 31 on the outer portion thereof. Thewiring is laced in and out of the wings 31 in the manner shown inFigures 3 and 4, said wiring beginning with inside terminal 18 andending with outside terminal 21. This outside terminal 21 is led fromthe top of the coil under insulation 22 and the interlaced wiring to thecenter-of the coil as shown in Figure 4. On the inner side oi": the coilI provide a strip of insulating material 24, with the wires 19 attachedto the coil in any suitable manner. The terminal 18 is electricallyconnected to these wires 19. On the outer side of the coil I provide asimilar piece of insulating material 25 at right angles to the piece ofinsulating material 24, with wires 23 suitably attached to the outerside of the coil and which are electrically connected to the terminal21. 4

In mounting these coils upon the apparatus already described,I provide afriction clamp 12, of well known make, upon each of the arms 2 and 3anda similar clamp upon each side 01" the arm 26, through which projectsa piece of conducting material 11 of T' shape. Before fastening the Tpiece 11 in the clamp, however, I place one of the coils thereon throughthe center aperture 20 of the coil, so that the head 10 of the T piece11 is pressed across the wires 23 on the outer side of thecoil, thusforming an electrical connection therewith. I then push the shaft of theT piece well through the clamp until the coil is tight against the arm,where it is held by the said friction clamp 12. If more than one coil isdesired on each arm, I

simply remove the T piece from the clamp.

and place thereon as many more coils as are desired arranging the coilswith relation to each other so that the wires 23 on the outside of thefirst coil cross at right angles the wires 19 on the inside of thesucceeding coil, so as to form an electrical connection therewith, andcontinuing in this manner until all the coils desired are inplace andthen again insert the T piecell in the clamp 12 as in the case when Ionly use one coil. For convenience in assembling more than one coil in acircuit in this manner, so that the wires 23 and 19 otthe differentcoils will always cross at right angles, the insulating pieces 22 on theouter side of the coils may be colored for identification and simplykept in alignment when the coils are assembled. This also serves to keepthe coils poled in the same direction.

The electrical connections for the primary and tickler coils are formedin a similar manner, so that I shall describe such connections jointly.

I provide terminal posts 17 on the main support 1, through which thecurrent enters and is conducted thence through a strip or plate ofconducting material to the upper rod 7, also of conducting material,thence through the upper part of clip 6 and hinge 5, through a piece ofconducting material 15 attached to but insulated from the arms 2 and 3to the clamp 12, thence through the shaft of the T piece 11 to the head10 thereof, thence through the wires 23 on the last coil in the circuitto the coils and through the same by reason of their being electricallyconnected as before described to number 13, which extends broadside ofthe arms 2 and 3. to the piece of conducting material 16 on the bottomof the arms 2 and 3. Strip of insulating material 14 insulates themember 13 from the clamp 12 and the shaft of the T piece 11; The currentthen passes through the member 16 to the lower half of the hinge 5,thence through the lower part of the clip 6' to the lower rod 7 and intothe terminal post- 36. I provide insulation 37 where the clip 6 joinsthe rods 7, so that the current which passes through the upper portionthereof going in and the lower portion going out will not short circuit.

Similar connections are made to the second coils on the arm 26 exceptthat the current flows directly from the terminal posts through theconducting material 35 to the clamps 12. on through T piece, coils,member 13 and conducting material on the bottom of the arm 26 similar tothat on the top to a terminal. post on the bottom of the main support 1.

lVherevcr necessary in this arrangement of electrical connections Ihave, of course, provided insulation for the conducting parts.

While I have shown my apparatus as consisting of primary, secondary andtickler coils, the tickler coil may at times be disconnected and onlythe primary and secondary coils used, if so desired.

Some changes may be made in the arrangement and construction of thevarious parts of my improved devices without departing from the spiritof the invention therein and it is my intention to cover by my claimssuch changes as may be reasonably included within the scope thereof.

' I claim as my invention:

1. An inductance coil mounting consisting of a main support and armsconnected thereto adapted to receive and place in electrical circuitinductance coils, and means whereby a plurality of coils may be added toor taken from the circuit.

2. An inductance coil mounting consisting of a main support and armsconnected thereto adapted to receive and place in electrical circuitinductance coils, and means for connecting in one circuit a plurality ofsaid coils by ressing and holding said coils col1ective y together. I

3. In an inductance coil mounting consisting of a main support and armsconnected thereto adapted to receive and place in coils, means wherebythe distance between the main support and either arm may be varied tocompensate for varying numbers or thickness of unit inductances in eachcircuit, so that coils on the arms when in position nearest coils on themain support may be held parallel with the latter or at any desiredangle thereto from to 90.

5. In apparatus of the class described, the combination of primary,secondary and ticlzler coils and a mounting consisting of a main supportand parallel arms connected thereto adapted to receive and place inelectrical circuit said coils, a means whereby the lateral distancesapart and the angles of the tickler and primary coils with respect tothe secondary coils may be simultaneously varied.

6. An inductance coil mounting consisting of a main support andlaterally extending conducting members attached to said support,parallel coil supporting and conducting arms slideably and hingeablyconnected to said laterally extending conducting members, means formounting inductance coils 7. An inductance coils mounting consist- 1 ingof a main support, laterally extending members attached to said support,coil supporting arms slidably and hingeably attached to said laterallyextending members,

inductance coils supported by said arms and means including saidlaterally extending members for forming anelectrical circuit beginningat terminals located on said main support, continuing thru one-or moresaid coils arranged in series in each circuit and back to otherterminals located on said main support.

8. An inductance coil mounting consisting of acoil supporting arm, afriction clamp fixed to said arm, and means held by said clamp forsupporting one or more inductance coils in operative relation.

G. RUDOLPH MUELLER.

